The opening ceremony is a great occasion. It is essential ______ for that.A、for

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问题 The opening ceremony is a great occasion. It is essential ______ for that.

选项 A、for us to be prepared
B、that we are prepared
C、of us to be prepared
D、our being prepared

答案 A

解析根据题意，似乎A、B都可以，但若选B，从句应用虚拟语气，因此正确答案是A。

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